package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setMealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        /*Step1. 向菜品表添加一条数据*/
        dishMapper.insert(dish);
        Long dishId = dish.getId(); //获取insert语句生成的主键值
        /*Step2. 向口味表添加n条数据*/
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!= null && !flavors.isEmpty()){
            //在插入之前需要遍历flavors列表，给每一项的dishId赋值
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            //向口味表插入n条数据
            dishFlavorMapper.insert(flavors);
        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     *
     * @param ids
     * @return
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        /*Step1. 判断当前菜品是否能够删除， 起售中无法删除， 被套餐关联无法删除*/
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE) {
                //处于起售中无法删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //被套餐关联无法删除
        List<Long> setMealIds = setMealDishMapper.getSetMealDishId(ids);
        if(setMealIds!=null && !setMealIds.isEmpty()){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        /*for (Long id : ids) {
            *//*Step2. 删除菜品表中的菜品数据*//*
            dishMapper.deteleById(id);
            *//*Step3. 删除菜品关联的口味数据*//*
            dishFlavorMapper.deleteByDishId(id);
        }*/
        //批量删除菜品数据
        dishMapper.deteleByIds(ids);
        //批量删除口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据菜品id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    @Override
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和口味信息
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        //删除口味表中原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!= null && !flavors.isEmpty()){
            //在插入之前需要遍历flavors列表，给每一项的dishId赋值
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //向口味表插入n条数据
            dishFlavorMapper.insert(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> selectByCategoryId(Long categoryId) {
        List<Dish> dishes =  dishMapper.selectByCategoryId(categoryId);
        return dishes;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        //如果进行的是停售操作，需要对包含当前菜品的套餐也停售
        if(status == StatusConstant.DISABLE){
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            List<Long> setMealIds = setMealDishMapper.getSetMealDishId(dishIds);
            if(setMealIds != null && !setMealIds.isEmpty()){
                for (Long setMealId : setMealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setMealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
}
